package com.itheima.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyInterceptor implements HandlerInterceptor {

    /*目标方法执行之前*/
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle...");
        String param = request.getParameter("param");
        if("yes".equals(param)){
            return true;
        }else {
            request.getRequestDispatcher("/error.jsp").forward(request,response);
            return false;
        }
    }
    /*目标方法执行之后，视图返回之前*/
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle");
        modelAndView.addObject("name", "com/itheima");
    }
    /*在流程执行完毕之后*/
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion...");
    }
}
